Method for preparing fructooligosaccharide by taking waste molasses as raw material

Abstract

The invention belongs to the technical field of deep processing of agricultural products, and particularly discloses a method for preparing fructooligosaccharide by taking waste molasses as a raw material. The method is characterized in that the method comprises the steps of taking the waste molasses produced during the sucrose refining production course, preparing a waste molasses solution with a mass concentration of 15-20%, dialysing with a 500Da nanofiltration membrane, concentrating a dialysate, adding the dialysate to immobilized transfructosylase directly, adjusting a pH value to be 5-6, saccharifying at 38-42 DEG C for 10-20h, filtering, decolorizing, hybridizing, concentrating, drying, and obtaining the finished solid fructooligosaccharide. According to the method, the waste molasses raw material replaces sucrose for preparing the fructooligosaccharide; the method is abundant in raw material source, simple and easy to operate, low in production cost and reasonable in technological design; the product quality meets a national standard of the fructooligosaccharide; the method is suitable for industrial production; economic benefits can be remarkably increased; and an additional value of a byproduct can be increased.

Description

technical field [0001] The invention belongs to the technical field of deep processing of agricultural products, and in particular relates to a method for preparing fructooligosaccharides from waste molasses. Background technique [0002] my country is an important sugar producing country, and sugar planting occupies an important position in the agricultural economy, ranking fourth after grain, oilseeds, and cotton. Taking Guangxi sugar industry as an example, the sugar mills in the region annually process more than 3 million tons of sugarcane and produce 100,000 tons of waste molasses. Cane molasses contains about 24% to 36% of sucrose, and about 12% to 24% of other sugars; almost all sugars in beet molasses are sucrose, as much as about 47%. In addition, the nitrogen-free extract also contains 3% to 4% soluble colloids, mainly xylose gum, arabic gum and pectin. At present, waste molasses is processed by selling it directly to livestock and poultry farms to feed lives...

AI Technical Summary

Problems solved by technology

There are the following problems in this way: (1) Workers directly add powdered activated carbon to the decolorization tank liquid, which will cause a large amount of activated carbon dust to fly, resulting in extremely bad working environment and serious pollution

(2) When the temperature in the decolorization tank rises to 80-100°C, bumping will often occur, causing the high-temperature liquid to overflow and splash, causing personal injury, so there will be certain safety hazards in this process

(3) Activated carbon often floats on the surface of the liquid in large quantities during the contact with the liquid. Even if it is fully stirred, it cannot be fully fused with the sugar solution quickly to achieve the purpose of decolorization as soon as possible. A large amount of waste is usually required during the decolorization process. The stirring time is longer, thus prolonging the product production cycle and causing waste of resources

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